Pinkos :)
This is nothing new about this story .You find many in a similar vein going back at to at least 2005 (that's as far back as I could be bothered to look for stories where the newspapers were getting their knickers in a twist).
Its the same as any other private hirer session. They probably bring their own attendant or sign a disclaimer that they don't want one. In which case its perfectly reasonably that the staff use the 1hour 30 minute session for training purposes.
The sessions are posted smack bang in the middle of the pool schedule hardly secretive.
http://www.hullcc.gov...portal&_schema=PORTAL
I wouldn't expect them to print up a special staff training/muslim swimming sign just in case somebody saw the pool was shut, went home, checked on the site and then contacted the national press due to the outrage of a segregated swimming session.